Delivery catheter for implantable medical device

Abstract

A kit for intravascular implantation of an implantable medical device (IMD) within a patient includes the IMD, an elongated shaft, and a locking mandrel. The IMD comprises a fixation assembly comprising a loop and defines at least one longitudinal lumen and a port in fluid communication with the lumen. The shaft is sized to traverse a vasculature of the patient. The port is sized to receive at least a portion of the loop. The locking mandrel is configured to be positioned within the at least one lumen of the shaft and to pass through the loop within the lumen at the port. A reduced profile portion of the shaft defines a reduced profile with respect to at least one other portion of the shaft. At least a portion of the reduced profile portion is configured to be adjacent to the IMD when the IMD is positioned on the shaft.

What is claimed is: 
     
       1. A kit for intravascular implantation of an implantable medical device within a patient, the kit comprising:
 the implantable medical device comprising a device housing and a fixation assembly comprising a loop: 
 an elongated shaft having a distal portion and defining at least one longitudinal lumen and having a port located proximal to the distal portion and in fluid communication with the lumen, the shaft sized to traverse a vasculature of the patient and the port sized to receive at least a portion of the loop of the fixation assembly of the implantable medical device; and 
 at least one locking mandrel configured to be positioned within the at least one lumen of the shaft, configured to pass through the loop of the fixation assembly of the implantable medical device while the device housing is located exterior to the shaft and proximal to the distal portion thereof and the portion of the loop is located within the port, and configured to extend within the at least one lumen distally from the port and from the portion of the loop therein, 
 wherein a reduced profile portion of the shaft defines a reduced profile with respect to at least one other portion of the shaft, wherein at least a portion of the reduced profile portion is configured to be adjacent to the device housing when the implantable medical device is positioned on the shaft; and 
 wherein the elongated shaft comprises a locking shaft defining the port and a guidewire shaft, wherein the locking shaft defines a locking lumen configured to receive the locking mandrel, wherein the guidewire shaft defines a guidewire lumen configured to receive a guidewire, wherein the locking shaft is twisted about the guidewire shaft. 
 
     
     
       2. The kit of  claim 1 , wherein the port comprises a first port and the shaft defines a second port, wherein the second port is configured to receive at least a portion of a housing of the implantable medical device, wherein the locking mandrel is configured to pass through a lumen defined by the housing of the implantable medical device at the second port. 
     
     
       3. The kit of  claim 1 , wherein the at least one lumen of the elongated shaft is configured such that a guidewire and the locking mandrel may be positioned adjacent to one another within the at least one lumen. 
     
     
       4. A kit for intravascular implantation of an implantable medical device within a patient, the kit comprising:
 the implantable medical device comprising a device housing and a fixation assembly comprising a loop; 
 an elongated shaft having a distal portion and defining at least one longitudinal lumen and having a port located proximal to the distal portion and in fluid communication with the lumen, the shaft sized to traverse a vasculature of the patient and the port sized to receive at least a portion of the loop of the fixation assembly of the implantable medical device; and 
 at least one locking mandrel configured to be positioned within the at least one lumen of the shaft, configured to pass through the loop of the fixation assembly of the implantable medical device while the device housing is located exterior to the shaft and proximal to the distal portion thereof and the portion of the loop is located within the port, and configured to extend within the at least one lumen distally from the port and from the portion of the loop therein; and 
 wherein the elongated shaft comprises a locking shaft defining the port and a guidewire shaft, wherein the locking shaft defines a locking lumen configured to receive the locking mandrel, wherein the guidewire shaft defines a guidewire lumen configured to receive a guidewire, wherein the locking shaft is twisted about the guidewire shaft. 
 
     
     
       5. The kit of  claim 4 , wherein the port comprises a proximal port and the loop comprises a first loop of the fixation assembly of the implantable medical device, wherein the elongated shaft further defines a distal port in fluid communication with the at least one lumen and sized to receive at least a portion a second loop of the fixation assembly of the implantable medical device, each of the proximal port and the distal port being defined on a side wall of the elongated shaft. 
     
     
       6. The kit of  claim 5 , wherein the proximal port is circumferentially spaced approximately 180 degrees about the elongated shaft from the distal port. 
     
     
       7. The kit of  claim 4 , wherein the port comprises a first port and the shaft defines a second port, wherein the second port is configured to receive at least a portion of a housing of the implantable medical device, wherein the locking mandrel is configured to pass through a lumen defined by the housing of the implantable medical device at the second port.